A subprime lender eschewing adjustable-rate mortgages and utilizing an uncommon accounting method sees itself increasing mortgage originations this year, even as analysts predict an overall downturn in originations. Delta Financial Corp. offers nonconforming, predominately fixed-rate loans in 34 states. “Our business model is such that we will not be one of the biggest in our sector,” Delta president and CEO Hugh Miller said at last week’s JMP Securities research conference in San Francisco. He acknowledged,…